JPH0552364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a field dam using geotextile, in which cylindrical cells formed using geotextile are used for the raised portion of the field dam.

``Prior Art'' As is well known, fill dams are generally used to temporarily close waterways when constructing dams on rivers.

Conventionally, as this type of field dam, the one shown in FIG. 3 is known. In the figure, numeral 1 is the river bed and 2 is the water surface. At the top of the riverbed 1, an existing fill dam 3 (indicated by the two-dot chain line) has been constructed, with a height corresponding to the water level 2, and above it, the height corresponds to the water level 4, where the amount of water in the river has increased. A raised field dam 5 is constructed for this purpose.

An impermeable core 6 is provided inside the film dams 3 and 5, and on both sides of the impermeable core 6, permeable films 7 and 7 made of high-quality earth and sand are formed with a predetermined legal slope. To prevent field dams from collapsing, they are covered with cages, paved with concrete or asphalt, or covered with wire mesh, etc.

"Problems to be solved by the invention" However, in the conventional fieldum,
The higher the height of the embankment, the gentler the slope of the embankment, which requires a large amount of high-quality earth and sand for the embankment material, and the construction of which requires a large amount of large construction machinery. The cost was higher than that for a new construction, and there were problems such as poor construction efficiency, a long construction period, and economic difficulties.

The present invention was made in view of the above problems, and
Geotextile eliminates the need for a large amount of large construction machinery, has excellent workability by using locally sourced materials, shortens the construction period, and significantly reduces construction costs. The purpose is to provide the used field.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides a cylindrical cell formed using a geotextile made of a high-strength lattice net, and It is characterized by comprising a filter made of geotextile and earth and sand filled inside the filter.

In this case, it is desirable to provide at least one auxiliary material made of a planar lattice-shaped geotextile inside the cylindrical cell on a plane perpendicular to the axis of the cylindrical cell.

"Function" In the field dam using the geotextile of the present invention, the high-strength lattice-like cylindrical cells provide a confining effect to the filling soil, and the filling soil receives the interlocking effect of the reinforcing material, resulting in a greater It has high shear strength and high stability, and does not require a large legal gradient like conventional field dams. Furthermore, since geotextile is lightweight, it is easy to transport and handle, and since a filter is provided inside the cylindrical cell, the filled earth and sand will not flow out to the outside due to running water.

"Example" Hereinafter, an example of the present invention will be described using the drawings. FIGS. 1 and 2 show an embodiment of the present invention, and are a sectional view and a slope view of a field dam using geotextile. In these figures, the same elements as those in the conventional technique shown in FIG. 3 are given the same reference numerals, and their explanations will be omitted.

In FIG. 1, reference numeral A is a cell body constituting a field dam using geotextile, and as a raised part of the field dam provided to correspond to the water surface 4, it is attached to the upper surface of an existing field dam 3 with a part of its upper part cut off. is set up. The outer peripheral portion of the cell body A is a cylindrical cell 10 made of geotextile, and in this example, a lattice-like net of high-strength fibers, that is, aramid fibers with a diameter of about 8 mm are used as a lattice-like net at predetermined intervals. It is made of geotextile formed into a cylindrical shape. Cylindrical cell 1
Inside the 0, there is a stretched plastic net made by uniaxially or biaxially stretching a thick sheet of polypropylene or high-density polyethylene with holes punched along its inner circumferential surface to orient the polymer. A filter 11 made of geogrid is provided, and the inside of the filter 11 is filled with earth and sand 12 generated at the site at a predetermined density.

The filter 11 has a lattice mesh that prevents the packed soil 12 from flowing out to the outside by running water, and when the locally generated soil 12 is poor soil with low shear strength, the inside of the cylindrical cell 10 is A reinforcing material 13 made of a planar lattice-like geotextile made of aramid fibers is disposed on a plane perpendicular to the axis. This reinforcing material 11 is formed into a circular shape having a diameter that is approximately the same as the inner diameter of the cylindrical cell 10.
By being buried in layers with a predetermined interval between
3, so as to exhibit the effect of increasing shear strength.

In addition, the reinforcing material 13 has its outer peripheral part connected to the cylindrical cell 1.
It may be connected to 0, and locally generated sediment 1
It is not necessary if 2 is good quality soil with high shear strength.

Further, the upper part of the cylindrical cell 10 is covered with a geomembrane 14 for fading (lid) made of geotextile, and the lower part of the cell body A is covered with a geomembrane 14 as shown in FIG. 2 to increase stability. The structure is such that it is buried with 15 stones.

Further, in the field dam of this embodiment, a plurality of the cell bodies A, A, . . . are provided at predetermined intervals along the existing field 3, and the cell bodies A, A,
...The arc parts B, B, which are constructed using geotextile and filling earth and sand in the same way as the cell body A,
The walls are constructed by being connected by...

Therefore, in the field dam using geotextile of this example, the wall body is constructed by connecting the cell body A and the arc part B to the raised part of the existing field dam, and the cell body A has high strength. Since the cylindrical cell 10 made of fibers is filled with earth and sand 12 with high or increased shear strength, it has sufficient strength and stability as a wall. Since it does not require a gentle slope like conventional film dams, it is only necessary to use a small amount of locally generated soil, and the cylindrical cell 10, filter 11, reinforcing material 13, and geomembrane 14 are lightweight and inexpensive. Since it uses geotextile, it is easy to transport and handle, eliminating the need for a large amount of large construction machinery, and providing excellent workability. As a result, it is possible to shorten the construction period and achieve a significant reduction in construction costs.

Therefore, the film dam using the geotextile of the present invention can be used for raising the height of the film dam in remote areas in the mountains where site conditions are severe, for construction on remote islands where it is difficult to supply materials such as large construction machinery, and for temporary fireproofing of large civil engineering works. It can be used for dam construction, and for construction of land dams where it is difficult to secure land.

"Effects of the Invention" As explained above, the present invention includes a cylindrical cell formed using geotextile, a filter provided along the inner peripheral surface of the cell, and earth and sand filled inside the cell. This eliminates the need for a large amount of large construction machinery and makes it possible to use locally generated earth and sand, resulting in excellent workability, shortening the construction period, and significantly reducing construction costs. I can do it.

[Brief explanation of drawings]

Figure 1 shows one embodiment of the present invention, and shows a cross-sectional view of a field dam using geotextile;
The figure is a perspective view thereof, and FIG. 3 is a sectional view of a conventional field dam. A... Cell body, B... Arc part, 10... Cylindrical cell, 11... Filter, 12... Earth and sand, 13...
...Reinforcement material.

Claims (1)

[Claims] 1. A cylindrical cell formed using a geotextile made of a high-strength lattice net, a filter made of the geotextile provided along the inner peripheral surface of the cell, and earth and sand filled inside the cell. A field dam using geotextile, which is characterized by: 2. The method according to claim 1, wherein at least one reinforcing material made of a planar lattice-shaped geotextile is provided inside the cylindrical cell on a plane perpendicular to the axis of the cylindrical cell. Field dam using geotextile.